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Question Number 119483 by Ar Brandon last updated on 24/Oct/20
Leta>0andf:R→Rafunctionsatisfying f(x+a)=1+[2−3f(x)+3f(x)2−f(x)3]1/3 forallx∈R.Thenaperiodoff(x)iskawherekis apositiveintegerwhosevalueis (A)1(B)2(C)3(D)4
Answered by Olaf last updated on 25/Oct/20
f(x+a)=1+[2−3f(x)+3f(x)2−f(x)3]1/3 [f(x+a)−1]3=2−3f(x)+3f(x)2−f(x)3 [f(x+a)−1]3=1+[1−3f(x)+3f(x)2−f(x)3] [f(x+a)−1]3=1−[f(x)−1]3 [f(x+2a)−1]3=1−[f(x+a)−1]3 [f(x+2a)−1]3=1−(1−[f(x)−1]3) [f(x+2a)−1]3=[f(x)−1]3 f(x+2a)−1=f(x)−1 f(x+2a)=f(x) ⇒periodis2a(k=2)
Commented byAr Brandon last updated on 25/Oct/20
Merci monsieur
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